Write it down or right write it down

No I always say that there is no right or wrong way. But.... there kinda is. the way you do it for you is right. & its important to write in a journal.  A tennis journal.
 I have been keeping a book for the last ten years ( now recently stolen ) the book was an active part of playing, teaching, and coaching.
 the book is also a form of coaching that can help you legally in a match.  you might hear from a high performance coach keep notes while your playing. that's true  But if you have a journal with every experience you have ever had in it then it is like having a coach right by your side every time you switch sides and who knows your every habit. I will write more later